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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 1
 8
 2

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Electrical Machines
The armature shaft must be able to with stand

 Any unbalanced magnetic pull on the armature core.
All of these
 Bending moment due to weight of the armature.
 Twisting stains due to transmission of torque.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BRY
All of these
 BYR
 RBY

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 37
 74
 72
 36

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 44 A.
 40 A.
 400 A.
 440 A.

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  120 volt.
 220.4 volt.
  218.5 volt.
  None of these.

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